Brake and door interlock



, a E N 1 6 2 w m 0 o w mo M% A .F 338 5 m a W 1: 2 A t 3.

J. C. MCCUNE BRAKE AND DOOR 'INTERLOCK Filed May 16. 1929 Aug. 9, 1932.

FFI- CE JOSELEH-C. 'MCCTUNE, or. nnenwoon .BE'nnsYLvemA; Assienonlmo man WESTINGHQUSE .AIR nnexneommn'y, or wnrannnme, PENNSYLVANIA, n GQRZRORATION OF PENN- sYLvAnIA BRAKE AND noon IntrnRLooK Application filed May I6, 1929. "SeriaI'No. 363F182.

Fhis invention relatesto vehicle door andbrake controlling meansand more particularly to safety car-control equipment In which fluid under pressure is supplied to the brake cylinder when the-car door is open.

Theprincipalobject of my invention is-to.

provide an improved safety car control equipment-of the above type which, when the'ca r door is opened, Will preve'nt the sup plyof-fluid under pressure to thefbraike cylinder for a predetermined period of time after the opening-ofthe car door {has been initiated.

Another object of my invention is to providean improvedsa fety car control'equip} 'inent of the above type Whichisoperativeto prevent a full serviceapplicationofgthe brakes from being effected upon theopemn'g :of -the car door 'untIl a predetermlnedperiod of'time has elapsed. 7' Other objects andadvantageswvill appear 'inthe following niore detaileddescription of prise afbrake valve device 1,41 main reservoir 2, an emergency valve device 3; a brake cylinder 4, a door interlock valvedevlce 5 and a door engine 6. 7

casing having a chamber 7 constantly connected 'to the main reservoir Q -through pipe and passageS and containinga rotary valve 9 which is operated-.bya'handle10;

The emergency .ivalve .devicedmay com- P s a Casing -QJ idlflmbel Contain "flows to the door closing piston chamber 28 I ing aneniergency piston 12 which is adapted to operate an emergency slide valve '13 contamed-1n a chamber 14' Whichis constantly shown in Fig. 1 of the drawing.

taining a door-opening piston 26, saidpistons fbeing connected together ihy a bar27 "and adapted'tooperatethe car door (not-shown) position as shown Ks shownjinlthe accompanyingdrawing, the safety car control equipment may oom- The brake valve device-'1 may comprise 1 connected to the =1nainreservoir 2through passage and plpe -15. v The door nterlock VEtlVQClQVlCG maycom prise-acasing having chambers 16 andfll7- con- 7 p taining pistons 18 and 19 respectively which arc conne'cted together and which are adapted" to I operate a slide valve 20 contained in a chamber 21 constantly connected tothe main reservoir 2through the pipe 8. Also contained in the piston chamber 16 and interposed between'iand engaging the casing and "the piston l8, is aspring 22,tl1e pressure of which norma'll-y imainta'ins the pistons and slide valve 2O in their {right hand positionsasv Thedoor engine. f6 ij'n'ay comprise "a casing hav ng a door clos ng plstonchamber 23 containing a door (ilosingpistonfi lan'dalso hav ing a door opening piston chaniloer'25 conin the usua'l in anner.

With'thehrake valve device 1 in release in Figfil of the drawing,

fluid under pressure supplied to =the'main reservoir 2 flows-tethe slideval-ve chamber '21 in the door interlock valve device '5 and chamber 7 in theflora'ke valve device 1, througlipipe and passage 8. "From the-chamber? fluid'under pressureflovvs to theemergency piston chamber 11 through. apo rt '28 in the rotary-valve 9 and passages and pipe- 29; 7 e

' Froin'the main reservoir Q'fluid underpressn're flovvs'to theemergency slide valve charm 'ber l lthrough pipe 8,"and pipe and passage 15, and since the pressures in the emergency -piston chanibier '11 andvalve chamber 14 are substantially equal, "the pressure of a spring 30, contained in the piston chamber ll main- 'tains the-emergencyvalve device in its normal positlon, as shown 1n Fig. 1, for efi'ectlng a servlce appllcatl'on and the release of the brakes. v

From the passage 29, fluid under'pressure in the door engined by vv ay'of a cavity 31in the rotary Valve 9 of the brake valve device and door closing'passage and pip'e 32, and

from the pipe 32, fluid under pressure also flows to the piston chamber 16 in the. door interlock valve device 5through a branch pipe and passage 33.

Further, with the brake valve device in release position, thebrake cylinder 4 is vented to the atmosphere through a pipe andpassage 34, a cavity in the emergencyslide valve 13, a passage and pipe36, a cavity 37 in the rotary valve 9 of the brake valve device and atmospheric passage 38. I

The door opening piston chamber 25 in the door engine 6 is vented to the atmosphere by way of a door opening-pipe and-passage 39, cavity 37 in the rotary valve 9 and passage 38, and the piston chamber 17, in the door interlock valve device 5, is vented to the atmosphere through a passage 40, a choke plug 41, a passage and pipe 42 and door opening pipe 39. v 7

With the door opening piston chamber 25,

inthe door engine, thus vented, and the door closing piston chamber 23 supplied with fluid under pressure, the pistons 24 and 26 will be maintained in their door closing positions, as shown in Fig. 1. With the piston chamber 17 in the door interlock valve device 5 vented,

the pressure of the fluid supplied to the piston chamber 16 and thepressure of the spring 22 maintains the pistons-18 and 19 and the slide valve 20 in their right hand positions as shown in Fig. 1.

lVith the door interlock jslidevalve 20 in this position, the passage is connected to a chamber 43 at the underside ofa ball check valve 44,, by way of a passage 45, past a tapered choke pliig .46 having'screw-threaded connection with the casing of the door interlock valve device, a passage47, a cavity 48' in the door interlock slide valve 20 and a passage 49. The ball check valvev 44 is contained in a chamber whichis constantly connected to the passage 33 through a passage 51. Since the chamber 43 is vented, the ball check valve 44 will be seated, thus preventing the flow of fluid under pressure from the passage 33 to the passage 39. I

To effect a service application of the brakes the brake valve device 1 is operated to service position, as shown in Fig. 2 of the drawing,

in which, fluid under pressure issupplied from the chamber7 in the brake valve device to the brake. cylinder 4 by way. ofa port 52 in the rotary valve 9, passage and pipe 36, cavity 35 in the emergency slidevalve 13. and

passage and pipe 34. i

7With the brake valve device in this position the door closing piston chamber 23 in the door engine 6 and the piston chamber 16 in the door interlock valve device, emergency piston chamber 11 andemergency slide valve chamber 14 are maintained charged with fluid under pressure in thesame manner as when the brake valve devlce is in release pOSltlOi'l; The door opemng piston chamber 25 a nd the brake valve device, there being a passage 54 pressures on both sides of the emergency pis- 7 ton will be equalizedand the emergency valve piston chamber 17 in the door interlock valve device are maintained vented by Way of the door opening pipe and passage 39, a cavity 53 in the rotary valve 9 and passage 38.

When it is desired to open the car door, the brake valve device is operated to service door open position, as shown in Fig. 3, in which position, the rotary valve 9 closes oil the further supply of fluid under pressure to the emergency piston chamber '11'through the in the emergency valve device casing, through which'fluid under pressure is supplied from the passage 15 to the chamber 11, thus the device willbe maintained in service position by the pressure of the spring 30.

With the rotary valve in this position the door closing piston chamber 23 of the door engineisvented to the atmosphere through 776 .pipe and passage 32, a cavity 55 in therotary valve 9 and passage 38. The-piston chamber 16in the door interlock valve device 5 is also vented to the atmosphere through passage and pipe 33 and pipe 32. p Further with the rotary valve 9 in this position, fluid under pressure is supplied to the door opening piston chamber25 in the door engine through a port 56 in the rotary valve 9 and door opening passage and pipe 39. Fluid under pressure from the pipe 39-flows to-thepiston' chamber 17 in the'door interlock valve device 5 through pipe and passage 42, choke plug 41 and passage 40, and eo .from the passage 40 fluid underpressure is vented through passage 45, past the-tapered choke plug 46, through passage 47, and cavity 48 in the'slide valve 20 of the doorinterlock valve device, and from said cavity, pref- .1205 erably through passage 49 past the ball check valve 44, through chamber 50 and passage 51 and'from'thence to the atmosphere by [Way of passage and pipe 33, pipe 32 and the brake valve device 1. -a: O

Theflow of fluid under pressure through the atmospheric connection from the passage 40 to the atmosphere is at' a slower rate than the rate at which fluid under pressure is supplied to the passage 40 and piston chamber 17in the .door interlock valve device, so that the pressure of fluid in the piston chamber 17 will build up slowly, the rate of the issvogse i :SllI'GkOf thespring 22andthe pressure of flui'd whichmay be present inv the piston chamber 16. As the-slidevalve 20is1thus moved, it gradually closes oft the flow of fluid through therpassage 47- and .eventually'entirely closes oil such flow so-that the pressure offiuid buildswup more rap-idly in the. chamber 17 @an'dncauses the pistons 18 and-l9 to operate to move the slide valve 20 to, itsextreme left hand position,;uncoverin'g a' passage' 57 connected'to the pipe 36, so that fluid under pressuretrom'the main reservoir 2 is supplied to the brake cylinder 4 through .pipe'S, valve chamber 21' in the door interlockvalve device,

ppast theendofthe. slide valve20,through Y vpassage 57,-pipeaud passage 36,.cavity in the emergency slidevalve 1'3and passage and. pipe 34, thus effecting. an application of the brakes.

It will be. noted that when the brake valve is operated to service door open position the door will 'be 'CallSQdi'tO open and after a predetermined period of time has elapsed, a full service application of'the brakes is efiected,

the duration of saidaperiodbeingdependent uponthe rate ofbuildiup of pressure onthe 'face ofthe'piston 190i the door interlock valve device, ,asgoverned by the rateof the How of fluid'through the choke plug 41 and therate otthe flow oi'i'fluid 'to'the atmosphere past'the choke-plug 46, which choke car.

plug is ad aptecl'to be adjusted to 'varythe.

rate of the flow of fluid thereapast and-consequently vary the duration of the period of timegbetween the opening of the car door "and-the efiectingof a'full service application of the brakes andmaintaining the brakes appliedwhile-the door is openr' r Should the operator, in bringing thecar to a-stop, misjudge thespeed of the car, and operatethebrake valve device to service door 4 open positionbefore the speed of the car has been reduced sufficiently, 'thedoor interlock Valve device will operate to prevent-a 'full service application orthe-brakes from being effected until apredetermi'ned'time periodhas elapsed,thuspermitting thespeed of the car .to be further reduced without an increase in the pressure of fluid in the brake cylinder, which results in. the'gentle stopping of the If the door interlock valve device shouldbepermitted to; operate to supply fluid under pressure to the brake cylinder immediatelyupon-the operation of the'brake valve device to service dooropen position, a full service application otthe brakes would be reflected which-would result in -the harsh stopping of" the car, which is very ob ec- =tionable. p

To close the door and release thebrakathe brake valve device is operated to release position, in which, the door closing piston chamber 23 is again supplied with fluid underpres. ,sure andthedoor opening piston chamber 25 isventedto the atmosphere, and the piston chamber .16 in the door interlock valve- 'dea vice is again supplied=with fluidurider pressure and the; piston chamber [17* vented to the atmosphere. .F-luid underpressure: thus su pplied. tothe piston chamber 16,'together with thepressure. of the spring. 22,.c'ausesthe door interlock valve deviceito operate to its extremeright; hand position shown in'Fig. 1, in Which.position-,.-the cavity 48in the: slide valve .20 :-again establishes communication from the passage .lO to the passage 33, the ball check valvejidd preventingthe-flowof fluid from the passage 33 to the passage 40 2\nd pistonechamber 17.

cylinder 4 flows to the atmospherethrough device and passage 38.

Withathe brake valve device in release'posi tlOIl, .fluid under :pressure from the brake the brake valve *pipean'd' passage "34, cavity-35in the emergenzcyslide valve13,passage and pipe 36, cavity. 37: in the rotary valve 9 of lNhile one illustrative embodiment-jot the invention has been described indetail, it is operating. "with said fluid pressure brake equipment and said door controlling means operative automatically after the opening of the vehicle door is initiated for supplying fluid under. pressure to the brake cylinder,

said slow acting means being set in operation upon the initiation of the opening' of said door; a

2. The combination with afluid pressure brakerequipment anddoor controllingmeans for avehi'cle, of a brake cylinder forming part of said equipment, 'a -fluid pressure supply source, and slow acting means cooperating with said fluidpressure brake equipmentand door is initiated fo-restablishing communication from' said fluid pressure supply source to thebrake cylinder, said 'sloW- acting means being set in operation upon the initiation of the opening ofsaid door.

3. The combination witha fiuid pressure brake equipment and door controlling means for a vehicle, o fa brake cylinder forming part of-said equipment, slow acting means cooperating with said fluid pressure brake equip ment' and saiddoor controlling meanszoper'ative automatically to. supply'fluid 'underpressure to the brake cylinder after the opening V of the vehicle door is'initiat'ed, and means for governing ther-time at which @the slow acting said door controling means operative "au't0- matically after the opening of the vehicle ii? 9 means for governing the action of said valve ;means operates to supply fluid under pres sure to the brake cylinder. r V

4. The combination with a fluid pressure brake equipment and doorcontrolling' means for a vehicle, of a brake cylinder forming part of said equipment,slow acting pressure sensitive means cooperating with said fluid pres sure brake equipment and said door control ling means set in operation'automatically upon the opening of the vehicle door for supplying fluid under pressure-to the brake cylinder, and means for governing the operation of said pressure-sensitive means to delay the supplying of fluid under pressure'tothe brake cylinder for a predeterminedperiod of .time after the opening ofthe-vehicle door has been initiated.

Y 5. The combination with a fluid pressure brake equipment for a vehicle, of means for controlling the opening of the vehicle door, and slow acting means set in operation auto- .matically upon the opening of the door being to supply fluid, under pressure to the door englne and to sald valve means, and means for retardlng the-actlon of sa1d valve means to supply fluid under pressure to the brake cylinder.

,7. In a fluid pressure brake and'door controlling equipment for a vehicle, the combination with a brake cylinder, of a doorfengine operative by fluid under pressure to open the vehicle door, slow acting valve means operative by fluid under pressure to supply fluid under pressure to the brake cylinder to effect ,an application of the brakes, a valve device operativeto supply fluid under pressureto the door engineand tosaid valve means, and

means to delay the supplying of ,fluid under pressure to the brake cylinder for a predetermined period of time. r

' 8. In a fluid pressure brake and door controlling equipment fora vehicle, the combination with a brake cylinder, of a door engine operative by fluid under pressure toopen the vehicle door, valve means operative by fluid under, pressure tosupply fluid under pressure to the brake cylinder to effect an application of the brakes, a valve device operativeto supply fluid under pressure to the door engine and to said valvelineans, means for retarding the action ofsaid valve means to delay, for a predetermined period of time,

.the'supplying of flu'idunder pressure to the brake cylinder, and'means adjustable to vary the. duration of said period of time.

9. In a'fluid pressure brake and door controlling equipment for'a vehicle, the combination Witha brake cylinder, of a door engine operative by fluid under.- pressure .to openthe vehicle door, valve means operative vbyfluid under pressure to supply fluid under pressure to the brake cylinder to effect anap- .plication of the brakes, a valve device operative to supply fluid under pressure to the door engine and to said valve means, means for retarding the action of said valve means to delay, for a predetermined period of time, the supplying of fluid underpressure to the brake cylinder, and a choke plug adjustable to vary the durationof said period-of time.

10. In a fluid pressure brake and doorcontrolling equipment for a vehicle, the combination'with a brakecylinder, of a door engine operative by fluid under pressure to open the vehicle door, a valve operative to supply fluid under pressure tosaid brake cylinder, a piston subj ectto the pressure of fluid for operating said valve, a valve device operative. to one position to'supply fluid under pressure to said door engine toefl'ect the opening of the vehicle door and to'supply fluid I under pressure to the face ofsaid piston to operate said valve, and means for retarding the build up of pressure on the face of said piston. V V

11.- Ina fluid pressure brake and door con- H trolling equipment for a vehicle, the combination with a brake cylinder, of a door engine operative by fluid underpressurefto.

open the vehicle door, a valve operative to supply .fluid" under pressure to said brake cylinder, a piston'subject to the pressureof fluid for operating said valve, a valve device operative to one position to supply fluid under pressure to said door-engine to effect the opening of the vehicle door and to supply "fluid under pressure to the face of said piston to operate said valve, and means for venting fluidrunder pressure from the'face of said pistonat a slower rate than it is being supplied to saidface.

12. In a fluid pressure brake and door c-ontrolling equipment for a vehicle,the combination with a brake cylinder, of a door engine operative by fluid under pressure to open the vehicle door, a valve operative-t0 supply fluid under pressure to said brake cyl- -inder, a piston subject to the pressure of fluid, for operating said valve, a valve device operative to one' position to supply fluid under pressure to said door engine to effect the opening of the vehicle door and to supply fluid under pressure to the face of said piston to operate said valve, means for venting fluid under pressure from the face of said piston at a slower rate than it is being supplied to said face, and means adjustable to vary the rate of the flow of fluidfrom the face of said piston. 7

18. In a fluidpressure brake and door controlling equipment for a vehicle, the combi- 5 nation with a brake cylinder, of a door engine operative by fluid under pressure to open the vehicle door, a valve operative to supply fluid under pressure to said brake cylinder, a piston subject to the pressure of 10 fluid for operating said valve, a valve device operative to one position to supply fluid under pressure to saiddoor engine to effect the opening of the vehicle door and tosupply fluidunder pressure to the face of said piston to operate said valve, and means for venting fluid under pressure from the face of said piston at a slower rate than itis being supplied to said face to delay the operation of saidvalve to a position to supply fluid under pressure to the brake cylinder, said valve,

when in position to supply fluid under pressure to the brake cylinder, closing communication through which fluid is vented from the face of said piston. r V

In testimony whereof I have hereunto set my hand, this 13th day of May, 1929. V

JOSEPH C. MOCUNE. 

